diff -u b/apachesolr_search.module b/apachesolr_search.module
--- b/apachesolr_search.module
+++ b/apachesolr_search.module
@@ -1296,12 +1296,13 @@
 
     // Grouped by a specific field.
     if ($first_field) {
-      $groups = $response->grouped->{$first_field};
-      $total = $response->grouped->{$first_field}->$counter;
+      $groups = $response->grouped->$first_field;
+      $total = $response->grouped->$first_field->$counter;
     }
     // General group.
     else {
-      $first_group = array_keys(get_object_vars($response->grouped))[0];
+      $groups_array = array_keys(get_object_vars($response->grouped));
+      $first_group = reset($groups_array);
       $groups = $response->grouped->$first_group;
       $total = $response->grouped->$first_group->$counter;
     }